| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Belgium | 4 | |
| #2 | Switzerland | 4 | |
| #3 | France | 4 | |
| #4 | Canada | 3 | |
| #5 | Germany | 3 | |
| #6 | Italy | 2 | |
| #7 | United States | 2 | |
| #8 | Austria | 1 | |
| #9 | Denmark | 1 | |
| #10 | United Kingdom | 1 | |
| #11 | Japan | 1 | |
| #12 | Norway | 1 | |
| #13 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Consumer goods | |
| #5 | Measurement |
| # | Name | Total Patents |
|---|---|---|
| #1 | Okada Jujiro | 10 |
| #2 | Satoo Isamu | 4 |
| #3 | Sato Isamu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3885481A | Method to produce an oval product having oval circumference by cutting process | |
| CA988336A | Method to produce an oval product having oval circumference by cutting process | |
| US3859888A | Oval screw | |
| GB1188163A | An Elliptically-Headed Screw |